Screw



M y 1932. H. F. KELLOGG SCREW Filed May 22. 1930 I fizz/64 EH39 1 I fi/ZK 0/3;

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- M project from the shank and folded along the the shank. This screwhead is desirably made Patented May 31, 1932 I I 1,860,715

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Pirrsv I-IARRY F. KELLOGG, OF CHICAGO, ILLINOIS SCREW Application filedMay 22, 1930. Serial No. 454,633.

My invention relates to screws which are a screw constructed inaccordance with the provided with gripping heads whereby theypreferredembodiment of the invention, thismay be manually turned andmore particufigure also illustrating, in section, a support larly tothose screws in which the heads are and an object held in assembly withthe supv 53 separately formed and afterwards applied port by means ofthe screw F 1g. 2 1s an- 55 to the shanks of the screws. other elevationof the screw taken at right My invention has for its general objectangles to the direction in which Fig. 1 is the formation of an appliedscrew head which taken; Fig. 3is a plan view of the parts shown isconformable to the thumb and finger of ain Fig. 1'; Fig. 4: is sectional:view on line if? user and is of such shape as to permit it to et-4 ofFig. 3 with a portionzof the shank be made of light material withoutimpairing shown in full elevation; Fig. 5 is asectional its strength.view on line 55 of Fig. 3 with a portion In accordance with onecharacteristic of of the shank broken away; and Fig. 6 is a theinvention the screw head is made of sheet plan view of a sheet metalblank from which metal and has its mid-portion ribbed andapthepre'ferredform of screw head may be 65 plied to one end of theshank. In accordance shaped.

with another characteristic of the invention The screw illustrated isinclusive'fof a the head is of cup formation, the bottom of threadedshank 1 having one end portion the cup being applied to the shank andopposhaped into a flange 2 that extends laterally site the sides of thecup being shaped to conof the shank throughout its circumference.

stitute thumb and finger holds. The metal from which the screw shank isIn the preferred embodiment of the invenmade is usually orpreferablyiron which is tion the end portions of the head are bent toalso true of the head that is to be applied to median line of the headto constitute thumb of a piece of sheet metal-initially in the fornr andfinger engaging wings. The sides of of a fiat plate 3 as illustrated inFig. 6. The the mid-portion of the head are also desirably head formedfrom such blank is desirably bent away from the shank into strengtheninggiven its final shape before it is applied to ribs that merge with thewings and constitute, the screw shank. The mid-portion of the 59 withthe wings, a cup formation whose bothead is suitably applied, as bywelding, to the tom is applied to the shank. The end porflange end 2 ofthe shank 1. The end portions tion of the shank to which the head isapplied of the head are bent to project from the p is desirably formedinto a flange which afshank and are folded along the median line fordsamuch increased shank portion for the of the head to constitute thumband finger V attachment of the head thereto and to make engaging wingsland The sides 6 and it unnecessary to apply the head to the shank 7 ofthe mid-portion of the head are bent with accuracy. The attachment isdesirably away from the shank into strengthening ribs efiected bypassing welding heat producing that merge with the base ends of thewings'to electric current through the abutting faces constitute, withthe wings, a cup formation. 49 of the shank and head. The flange uponthe The wings are desirably of U-shape, in plan,

shank permits the head to be welded to the so that thee-up cavity,although as here illusshank laterally of the threaded portion of tratedmainly circular, is diametrically er;- the shank to strengthen theleverage between tended into the spaces embraced by the wings. the headand shank. The use of sheet metal The ribs 6 and 7 are diametricallyopposite 45 for the construction of the screw head en and extendsufiiciently laterally of the shank ables the welding heat to beconcentrated at beyond the wings to afford resting places for theengaging faces of the head and shank. the thumb and finger of the userand to posi- The invention will be more fully explained tion the same incomfortable engagement in connection with the accompanying drawwith thewings. ings in which Fig. 1 is a view in elevation of The iron fromWhich e screw head is made is sufficiently thick to produce a strongscrew head and is sufliciently thin to be readily raised to welding heatby means of suitable electric current lending itself readily to spotwelding. The flange is alsoof approximately the same thickness as themetal of the head so that it also may readily be raised to welding heat.The welding current is applied when the head is placed in the positionit is to occupy upon the shank and is quickly effective to secure themerger of the head and shank flange. It will be observed that the shankflange 2, and not the screw head,'maintains the clamping pressure thatsecures the object 8 against the support 9 when the screw is used asillustrated in Figs. 1 and 3. This may be of advantage in someinstances.

Changes may be made without departing from the invention.

1Having thus described my invention, I c aim: I

In a screw adapted to exert clamping pressure, the combination of athreaded shank; a 5 plate-like end portion on said shank form- 7 ing aflange extending laterally of the shank throughout its circumference; arelatively thin sheet metal head folded to form a central cupped portionhaving an imperforate flat bottom and thumb and finger wings integralwith said bottom, said plate-like'portion and said bottom being ofsubstantially equal area and having opposed faces contacting throughouta surface of equivalent area; :15 and means for intimately and rigidlyuniting said opposed faces substantially throughout their area ofcontact. In witness whereof, I hereunto subscribe my name.

40 HARRY F. KELLOGG.

